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  • Mines of Paris - Wikipedia

    The commercial product was Lutetian limestone for use as a building material, as well as gypsum for use in "plaster of Paris". Exploring the mines is prohibited by the prefecture and penalised with large fines [citation needed]. Despite restrictions, Paris' former mines are frequently toured by urban explorers known popularly as cataphiles.

  • Limestone: The Calcium Carbonate Chemical Sedimentary Rock